(Extra) Low-Level Heatbed Standoffs / Dampers / Leveling Colums / Spring Replacement for the ELEGOO Neptune Heatbed springs
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The springs on my ELEGOO Neptune 4 Pro printer had been quite crooked / bent, which is why I replaced them with dampers.
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The existing springs on my ELEGOO Neptune 4 Pro printer have been quite crooked / bent. For better stability I always tried to keep them as low to the bed as possible, but the maximum compression led to a quite uneven bed. For other printers you can buy silicone dampers to replace the heatbed springs with. However for the ELEGOO Neptune models, the insulation on the bottom of the headbed prevents to properly attach the commercially available silicone dampers. Additionally the dampers have been quite high-profile, leading to wobble during the print.
I created some low-profile (16mm, 5/8 inch) dampers and extra low-level (only 11mm, 7/16 inch), that fit the existing cutouts of the ELEGOO Neptune 4 heatbed. I printed them with heat resistent (up to 137°C) but flexible Extrudr TPU Flex medium filament (5 wall loops to create a solid center column and 50% triangular infill for the base) and they are a drop-in replacement for the ELEGOO springs.
Installation Procedure
To install the dampers and replace the springs, fully undo all four leveling knobs of the heatbed. The screws should come off and you can lift the heatbed. Remove the springs and replace them with the dampers.
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Note that for the extra low-level dampers the crimps of the Y-Axis belt would actually push into the heatbed insulation and cause the heatbed to deform. To prevent that, loosen the Y-Axis belt tensioner all the way and then zip-tie the crimps down to the bed. For me this worked flawlessly in operation so far:
Last step is to level your print bed. Note that the Z-screw adjustment now has significantly less tolerance. If your bed leveling is way off, check that the dampers are actually installed correctly / not caught onto some insulation or the heatbed cables on the rear right. You can also use the single layer shims provided, in order to compensate for any warping in the bed. The shims should however be your last resort.